How to Fix Common ESLint Errors: Troubleshooting Unknown or Strange Issues

When get the error by running

npm run lint -w myFolder

Error messages

Oops! Something went wrong! :(

ESLint: 9.12.0

TypeError: ObjectSchema is not a constructor
    at new Config (/node_modules/eslint/lib/config/config.js:175:24)
    at [finalizeConfig] (/node_modules/eslint/lib/config/flat-config-array.js:216:16)
    at FlatConfigArray.getConfigWithStatus (/node_modules/@eslint/config-array/dist/cjs/index.cjs:1102:55)
    at FlatConfigArray.getConfig

    ...

Root cause

The version specified in package.json is 9.9.0, but the error log shows that the command is running ESLint version 9.12.0:

The issue arises because I use Bun to manage the packages in my project, but when running npm run lint -w myFolder, it uses npm (the Node.js package manager) instead of Bun. This causes a version mismatch, as npm installs or uses a different version of ESLint than the one managed by Bun.

Solution

Install the same version of ESLint as specified in package.json in Node.js using npm by running the following command:

npm i eslint@9.9.0 -D

Check the installed version

npm ls eslint

Check the output to see if the version is correct

Run the command below again to see the correct results

npm run lint -w myFolder